What Happens When Galaxies Die?

About half of the galaxies in our universe are dead, but how exactly did that happen? How do galaxies die?

Why Are Most Galaxies Spiral Shaped? - https://youtu.be/aIUu5uMKB70
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'Dead' Galaxy May Hide Dark Matter Surprise
http://www.seeker.com/dead-galaxy-may-hide-dark-matter-surprise-1770502680.html
"While measuring the speed of stars whirling around a nearby dwarf galaxy, astronomers have realized that a reservoir of dark matter may be lurking within."

Is our Milky Way galaxy a zombie, already dead and we don't know it?
http://phys.org/news/2016-01-milky-galaxy-zombie-dead-dont.html
"Like a zombie, the Milky Way galaxy may already be dead but it still keeps going. Our galactic neighbor Andromeda almost certainly expired a few billion years ago, but only recently started showing outward signs of its demise."

Hubble Sees 'Ghost Light' From Dead Galaxies
https://www.nasa.gov/content/goddard/hubble-sees-ghost-light-from-dead-galaxies/
"NASA's Hubble Space Telescope has picked up the faint, ghostly glow of stars ejected from ancient galaxies that were gravitationally ripped apart several billion years ago. The mayhem happened 4 billion light-years away, inside an immense collection of nearly 500 galaxies nicknamed "Pandora's Cluster," also known as Abell 2744."

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Written by: Trace Dominguez